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Sennheiser CX 400BT True Wireless review: New premium earbuds sound great but are a bit chunky - CNET
Best Buy: Sennheiser CX 400BT True Wireless Earbud Headphones Black CX400TW1 Black
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Amazon.com: Sennheiser CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, White : Everything Else
Sennheiser CX 400BT True Wireless review: A battery that just doesn't give in - Neowin
Amazon.com: Sennheiser Consumer Audio Sennheiser CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, Black : Everything Else
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Sennheiser CX 400BT review: Great Sound, But Not Much Else | Digital Trends
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Amazon.com: Sennheiser Consumer Audio Sennheiser CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, Black : Everything Else